/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.badlogic.gdx.utils;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UTFDataFormatException;

/**
 * Taken from http://www.javafaq.nu/java-example-code-1079.html
 * @author mzechner
 * 
 */
public class LittleEndianInputStream extends FilterInputStream implements DataInput {

	  private DataInputStream din;
	  
	  public LittleEndianInputStream(InputStream in) {
	    super(in);
	    din=new DataInputStream(in);
	  }
	  
	  public void readFully(byte[] b) throws IOException {
	    din.readFully(b);
	  }
	  
	  public void readFully(byte[] b, int off, int len) throws IOException {
	    din.readFully(b, off, len);
	  }
	  
	  public int skipBytes(int n) throws IOException {
	    return din.skipBytes(n);
	  }
	  
	  public boolean readBoolean() throws IOException {
	    return din.readBoolean();
	  }

	  public byte readByte() throws IOException {
	    return din.readByte();
	  }

	  public int readUnsignedByte() throws IOException {
	    return din.readUnsignedByte();
	  }
	  
	  public short readShort() throws IOException {
	    int low=din.read();
	    int high=din.read();
	    return (short)((high << 8) | (low & 0xff));
	  }
	  
	  public int readUnsignedShort() throws IOException {
	    int low=din.read();
	    int high=din.read();
	    return ((high & 0xff) << 8) | (low & 0xff);
	  }
	  
	  public char readChar() throws IOException {
	    return din.readChar();
	  }
	  
	  public int readInt() throws IOException {
	    int[] res=new int[4];
	    for(int i=3;i>=0;i--)
	      res[i]=din.read();
	    
	    return ((res[0] & 0xff) << 24) |
	           ((res[1] & 0xff) << 16) |
	           ((res[2] & 0xff) << 8) |
	           (res[3] & 0xff);
	  }

	  public long readLong() throws IOException {
	    int[] res=new int[8];
	    for(int i=7;i>=0;i--)
	      res[i]=din.read();
	    
	    return (((long)(res[0] & 0xff) << 56) |
	            ((long)(res[1] & 0xff) << 48) |
	            ((long)(res[2] & 0xff) << 40) |
	            ((long)(res[3] & 0xff) << 32) |
	            ((long)(res[4] & 0xff) << 24) |
	            ((long)(res[5] & 0xff) << 16) |
	            ((long)(res[6] & 0xff) <<  8) |
	            ((long)(res[7] & 0xff)));
	  }
	  
	  public float readFloat() throws IOException {
	    return Float.intBitsToFloat(readInt());
	  }
	  
	  public double readDouble() throws IOException {
	    return Double.longBitsToDouble(readLong());
	  }

	  public final String readLine() throws IOException {
	    return din.readLine();
	  }

	  public String readUTF() throws IOException {
	    return din.readUTF();
	  }
}
